If there was not a rule or code regarding acid dipping your car then the rules were not broken because there wasn't a rule to break. I acid dipped the hood on my mustang. That being said, it's cheaper to buy a fiberglass hood these days. But we were at the shop and did it just to try it. It might have took ten pound off. But the mustangs hood weighs a million pounds so it was mostly for naught. We just wanted to try it